1/*******************************************************************************
2 *
3 * Module Name: utstring - Common functions for strings and characters
4 *
5 ******************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2015, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions, and the following disclaimer,
16 *    without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 *    substantially similar to the "NO WARRANTY" disclaimer below
19 *    ("Disclaimer") and any redistribution must be conditioned upon
20 *    including a substantially similar Disclaimer requirement for further
21 *    binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 *    of any contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acnamesp.h"
47
48#define _COMPONENT          ACPI_UTILITIES
49ACPI_MODULE_NAME("utstring")
50
51/*
52 * Non-ANSI C library functions - strlwr, strupr, stricmp, and a 64-bit
53 * version of strtoul.
54 */
55#ifdef ACPI_ASL_COMPILER
56/*******************************************************************************
57 *
58 * FUNCTION:    acpi_ut_strlwr (strlwr)
59 *
60 * PARAMETERS:  src_string      - The source string to convert
61 *
62 * RETURN:      None
63 *
64 * DESCRIPTION: Convert string to lowercase
65 *
66 * NOTE: This is not a POSIX function, so it appears here, not in utclib.c
67 *
68 ******************************************************************************/
69void acpi_ut_strlwr(char *src_string)
70{
71	char *string;
72
73	ACPI_FUNCTION_ENTRY();
74
75	if (!src_string) {
76		return;
77	}
78
79	/* Walk entire string, lowercasing the letters */
80
81	for (string = src_string; *string; string++) {
82		*string = (char)ACPI_TOLOWER(*string);
83	}
84
85	return;
86}
87
88/******************************************************************************
89 *
90 * FUNCTION:    acpi_ut_stricmp (stricmp)
91 *
92 * PARAMETERS:  string1             - first string to compare
93 *              string2             - second string to compare
94 *
95 * RETURN:      int that signifies string relationship. Zero means strings
96 *              are equal.
97 *
98 * DESCRIPTION: Implementation of the non-ANSI stricmp function (compare
99 *              strings with no case sensitivity)
100 *
101 ******************************************************************************/
102
103int acpi_ut_stricmp(char *string1, char *string2)
104{
105	int c1;
106	int c2;
107
108	do {
109		c1 = tolower((int)*string1);
110		c2 = tolower((int)*string2);
111
112		string1++;
113		string2++;
114	}
115	while ((c1 == c2) && (c1));
116
117	return (c1 - c2);
118}
119#endif
120
121/*******************************************************************************
122 *
123 * FUNCTION:    acpi_ut_strupr (strupr)
124 *
125 * PARAMETERS:  src_string      - The source string to convert
126 *
127 * RETURN:      None
128 *
129 * DESCRIPTION: Convert string to uppercase
130 *
131 * NOTE: This is not a POSIX function, so it appears here, not in utclib.c
132 *
133 ******************************************************************************/
134
135void acpi_ut_strupr(char *src_string)
136{
137	char *string;
138
139	ACPI_FUNCTION_ENTRY();
140
141	if (!src_string) {
142		return;
143	}
144
145	/* Walk entire string, uppercasing the letters */
146
147	for (string = src_string; *string; string++) {
148		*string = (char)ACPI_TOUPPER(*string);
149	}
150
151	return;
152}
153
154/*******************************************************************************
155 *
156 * FUNCTION:    acpi_ut_strtoul64
157 *
158 * PARAMETERS:  string          - Null terminated string
159 *              base            - Radix of the string: 16 or ACPI_ANY_BASE;
160 *                                ACPI_ANY_BASE means 'in behalf of to_integer'
161 *              ret_integer     - Where the converted integer is returned
162 *
163 * RETURN:      Status and Converted value
164 *
165 * DESCRIPTION: Convert a string into an unsigned value. Performs either a
166 *              32-bit or 64-bit conversion, depending on the current mode
167 *              of the interpreter.
168 *              NOTE: Does not support Octal strings, not needed.
169 *
170 ******************************************************************************/
171
172acpi_status acpi_ut_strtoul64(char *string, u32 base, u64 *ret_integer)
173{
174	u32 this_digit = 0;
175	u64 return_value = 0;
176	u64 quotient;
177	u64 dividend;
178	u32 to_integer_op = (base == ACPI_ANY_BASE);
179	u32 mode32 = (acpi_gbl_integer_byte_width == 4);
180	u8 valid_digits = 0;
181	u8 sign_of0x = 0;
182	u8 term = 0;
183
184	ACPI_FUNCTION_TRACE_STR(ut_stroul64, string);
185
186	switch (base) {
187	case ACPI_ANY_BASE:
188	case 16:
189
190		break;
191
192	default:
193
194		/* Invalid Base */
195
196		return_ACPI_STATUS(AE_BAD_PARAMETER);
197	}
198
199	if (!string) {
200		goto error_exit;
201	}
202
203	/* Skip over any white space in the buffer */
204
205	while ((*string) && (ACPI_IS_SPACE(*string) || *string == '\t')) {
206		string++;
207	}
208
209	if (to_integer_op) {
210		/*
211		 * Base equal to ACPI_ANY_BASE means 'ToInteger operation case'.
212		 * We need to determine if it is decimal or hexadecimal.
213		 */
214		if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
215			sign_of0x = 1;
216			base = 16;
217
218			/* Skip over the leading '0x' */
219			string += 2;
220		} else {
221			base = 10;
222		}
223	}
224
225	/* Any string left? Check that '0x' is not followed by white space. */
226
227	if (!(*string) || ACPI_IS_SPACE(*string) || *string == '\t') {
228		if (to_integer_op) {
229			goto error_exit;
230		} else {
231			goto all_done;
232		}
233	}
234
235	/*
236	 * Perform a 32-bit or 64-bit conversion, depending upon the current
237	 * execution mode of the interpreter
238	 */
239	dividend = (mode32) ? ACPI_UINT32_MAX : ACPI_UINT64_MAX;
240
241	/* Main loop: convert the string to a 32- or 64-bit integer */
242
243	while (*string) {
244		if (ACPI_IS_DIGIT(*string)) {
245
246			/* Convert ASCII 0-9 to Decimal value */
247
248			this_digit = ((u8)*string) - '0';
249		} else if (base == 10) {
250
251			/* Digit is out of range; possible in to_integer case only */
252
253			term = 1;
254		} else {
255			this_digit = (u8)ACPI_TOUPPER(*string);
256			if (ACPI_IS_XDIGIT((char)this_digit)) {
257
258				/* Convert ASCII Hex char to value */
259
260				this_digit = this_digit - 'A' + 10;
261			} else {
262				term = 1;
263			}
264		}
265
266		if (term) {
267			if (to_integer_op) {
268				goto error_exit;
269			} else {
270				break;
271			}
272		} else if ((valid_digits == 0) && (this_digit == 0)
273			   && !sign_of0x) {
274
275			/* Skip zeros */
276			string++;
277			continue;
278		}
279
280		valid_digits++;
281
282		if (sign_of0x
283		    && ((valid_digits > 16)
284			|| ((valid_digits > 8) && mode32))) {
285			/*
286			 * This is to_integer operation case.
287			 * No any restrictions for string-to-integer conversion,
288			 * see ACPI spec.
289			 */
290			goto error_exit;
291		}
292
293		/* Divide the digit into the correct position */
294
295		(void)acpi_ut_short_divide((dividend - (u64)this_digit),
296					   base, &quotient, NULL);
297
298		if (return_value > quotient) {
299			if (to_integer_op) {
300				goto error_exit;
301			} else {
302				break;
303			}
304		}
305
306		return_value *= base;
307		return_value += this_digit;
308		string++;
309	}
310
311	/* All done, normal exit */
312
313all_done:
314
315	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
316			  ACPI_FORMAT_UINT64(return_value)));
317
318	*ret_integer = return_value;
319	return_ACPI_STATUS(AE_OK);
320
321error_exit:
322	/* Base was set/validated above */
323
324	if (base == 10) {
325		return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
326	} else {
327		return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
328	}
329}
330
331/*******************************************************************************
332 *
333 * FUNCTION:    acpi_ut_print_string
334 *
335 * PARAMETERS:  string          - Null terminated ASCII string
336 *              max_length      - Maximum output length. Used to constrain the
337 *                                length of strings during debug output only.
338 *
339 * RETURN:      None
340 *
341 * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
342 *              sequences.
343 *
344 ******************************************************************************/
345
346void acpi_ut_print_string(char *string, u16 max_length)
347{
348	u32 i;
349
350	if (!string) {
351		acpi_os_printf("<\"NULL STRING PTR\">");
352		return;
353	}
354
355	acpi_os_printf("\"");
356	for (i = 0; (i < max_length) && string[i]; i++) {
357
358		/* Escape sequences */
359
360		switch (string[i]) {
361		case 0x07:
362
363			acpi_os_printf("\\a");	/* BELL */
364			break;
365
366		case 0x08:
367
368			acpi_os_printf("\\b");	/* BACKSPACE */
369			break;
370
371		case 0x0C:
372
373			acpi_os_printf("\\f");	/* FORMFEED */
374			break;
375
376		case 0x0A:
377
378			acpi_os_printf("\\n");	/* LINEFEED */
379			break;
380
381		case 0x0D:
382
383			acpi_os_printf("\\r");	/* CARRIAGE RETURN */
384			break;
385
386		case 0x09:
387
388			acpi_os_printf("\\t");	/* HORIZONTAL TAB */
389			break;
390
391		case 0x0B:
392
393			acpi_os_printf("\\v");	/* VERTICAL TAB */
394			break;
395
396		case '\'':	/* Single Quote */
397		case '\"':	/* Double Quote */
398		case '\\':	/* Backslash */
399
400			acpi_os_printf("\\%c", (int)string[i]);
401			break;
402
403		default:
404
405			/* Check for printable character or hex escape */
406
407			if (ACPI_IS_PRINT(string[i])) {
408				/* This is a normal character */
409
410				acpi_os_printf("%c", (int)string[i]);
411			} else {
412				/* All others will be Hex escapes */
413
414				acpi_os_printf("\\x%2.2X", (s32) string[i]);
415			}
416			break;
417		}
418	}
419	acpi_os_printf("\"");
420
421	if (i == max_length && string[i]) {
422		acpi_os_printf("...");
423	}
424}
425
426/*******************************************************************************
427 *
428 * FUNCTION:    acpi_ut_valid_acpi_char
429 *
430 * PARAMETERS:  char            - The character to be examined
431 *              position        - Byte position (0-3)
432 *
433 * RETURN:      TRUE if the character is valid, FALSE otherwise
434 *
435 * DESCRIPTION: Check for a valid ACPI character. Must be one of:
436 *              1) Upper case alpha
437 *              2) numeric
438 *              3) underscore
439 *
440 *              We allow a '!' as the last character because of the ASF! table
441 *
442 ******************************************************************************/
443
444u8 acpi_ut_valid_acpi_char(char character, u32 position)
445{
446
447	if (!((character >= 'A' && character <= 'Z') ||
448	      (character >= '0' && character <= '9') || (character == '_'))) {
449
450		/* Allow a '!' in the last position */
451
452		if (character == '!' && position == 3) {
453			return (TRUE);
454		}
455
456		return (FALSE);
457	}
458
459	return (TRUE);
460}
461
462/*******************************************************************************
463 *
464 * FUNCTION:    acpi_ut_valid_acpi_name
465 *
466 * PARAMETERS:  name            - The name to be examined. Does not have to
467 *                                be NULL terminated string.
468 *
469 * RETURN:      TRUE if the name is valid, FALSE otherwise
470 *
471 * DESCRIPTION: Check for a valid ACPI name. Each character must be one of:
472 *              1) Upper case alpha
473 *              2) numeric
474 *              3) underscore
475 *
476 ******************************************************************************/
477
478u8 acpi_ut_valid_acpi_name(char *name)
479{
480	u32 i;
481
482	ACPI_FUNCTION_ENTRY();
483
484	for (i = 0; i < ACPI_NAME_SIZE; i++) {
485		if (!acpi_ut_valid_acpi_char(name[i], i)) {
486			return (FALSE);
487		}
488	}
489
490	return (TRUE);
491}
492
493/*******************************************************************************
494 *
495 * FUNCTION:    acpi_ut_repair_name
496 *
497 * PARAMETERS:  name            - The ACPI name to be repaired
498 *
499 * RETURN:      Repaired version of the name
500 *
501 * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
502 *              return the new name. NOTE: the Name parameter must reside in
503 *              read/write memory, cannot be a const.
504 *
505 * An ACPI Name must consist of valid ACPI characters. We will repair the name
506 * if necessary because we don't want to abort because of this, but we want
507 * all namespace names to be printable. A warning message is appropriate.
508 *
509 * This issue came up because there are in fact machines that exhibit
510 * this problem, and we want to be able to enable ACPI support for them,
511 * even though there are a few bad names.
512 *
513 ******************************************************************************/
514
515void acpi_ut_repair_name(char *name)
516{
517	u32 i;
518	u8 found_bad_char = FALSE;
519	u32 original_name;
520
521	ACPI_FUNCTION_NAME(ut_repair_name);
522
523	ACPI_MOVE_NAME(&original_name, name);
524
525	/* Check each character in the name */
526
527	for (i = 0; i < ACPI_NAME_SIZE; i++) {
528		if (acpi_ut_valid_acpi_char(name[i], i)) {
529			continue;
530		}
531
532		/*
533		 * Replace a bad character with something printable, yet technically
534		 * still invalid. This prevents any collisions with existing "good"
535		 * names in the namespace.
536		 */
537		name[i] = '*';
538		found_bad_char = TRUE;
539	}
540
541	if (found_bad_char) {
542
543		/* Report warning only if in strict mode or debug mode */
544
545		if (!acpi_gbl_enable_interpreter_slack) {
546			ACPI_WARNING((AE_INFO,
547				      "Invalid character(s) in name (0x%.8X), repaired: [%4.4s]",
548				      original_name, name));
549		} else {
550			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
551					  "Invalid character(s) in name (0x%.8X), repaired: [%4.4s]",
552					  original_name, name));
553		}
554	}
555}
556
557#if defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP
558/*******************************************************************************
559 *
560 * FUNCTION:    ut_convert_backslashes
561 *
562 * PARAMETERS:  pathname        - File pathname string to be converted
563 *
564 * RETURN:      Modifies the input Pathname
565 *
566 * DESCRIPTION: Convert all backslashes (0x5C) to forward slashes (0x2F) within
567 *              the entire input file pathname string.
568 *
569 ******************************************************************************/
570
571void ut_convert_backslashes(char *pathname)
572{
573
574	if (!pathname) {
575		return;
576	}
577
578	while (*pathname) {
579		if (*pathname == '\\') {
580			*pathname = '/';
581		}
582
583		pathname++;
584	}
585}
586#endif
587
588#if defined (ACPI_DEBUGGER) || defined (ACPI_APPLICATION)
589/*******************************************************************************
590 *
591 * FUNCTION:    acpi_ut_safe_strcpy, acpi_ut_safe_strcat, acpi_ut_safe_strncat
592 *
593 * PARAMETERS:  Adds a "DestSize" parameter to each of the standard string
594 *              functions. This is the size of the Destination buffer.
595 *
596 * RETURN:      TRUE if the operation would overflow the destination buffer.
597 *
598 * DESCRIPTION: Safe versions of standard Clib string functions. Ensure that
599 *              the result of the operation will not overflow the output string
600 *              buffer.
601 *
602 * NOTE:        These functions are typically only helpful for processing
603 *              user input and command lines. For most ACPICA code, the
604 *              required buffer length is precisely calculated before buffer
605 *              allocation, so the use of these functions is unnecessary.
606 *
607 ******************************************************************************/
608
609u8 acpi_ut_safe_strcpy(char *dest, acpi_size dest_size, char *source)
610{
611
612	if (ACPI_STRLEN(source) >= dest_size) {
613		return (TRUE);
614	}
615
616	ACPI_STRCPY(dest, source);
617	return (FALSE);
618}
619
620u8 acpi_ut_safe_strcat(char *dest, acpi_size dest_size, char *source)
621{
622
623	if ((ACPI_STRLEN(dest) + ACPI_STRLEN(source)) >= dest_size) {
624		return (TRUE);
625	}
626
627	ACPI_STRCAT(dest, source);
628	return (FALSE);
629}
630
631u8
632acpi_ut_safe_strncat(char *dest,
633		     acpi_size dest_size,
634		     char *source, acpi_size max_transfer_length)
635{
636	acpi_size actual_transfer_length;
637
638	actual_transfer_length =
639	    ACPI_MIN(max_transfer_length, ACPI_STRLEN(source));
640
641	if ((ACPI_STRLEN(dest) + actual_transfer_length) >= dest_size) {
642		return (TRUE);
643	}
644
645	ACPI_STRNCAT(dest, source, max_transfer_length);
646	return (FALSE);
647}
648#endif
649